According to 1910 census, Otto's parents were born in Switzerland. Note that mother Katherine was married twice, her marriage to John took place ca. 1905. She had six children, three living.
1920 census indicates both John and Katherine were naturalized.
Katherine and her daughter Johanna are living in Tucson, AZ in 1930 census. Here are links to their death certificates:http://genealogy.az.gov/azdeath/048/10480443.pdfhttp://genealogy.az.gov/azdeath/051/10510446.pdf